How long does it take for a native coin (BTC, LTC, BCH) transaction to be confirmed?

All Abra transactions are verified by the blockchain -- this is how we can ensure the money you're sending is yours to send. It's one of the ways we prevent fraud in the system.

It can take from 10 minutes to 4-6 hours for transactions to be confirmed on the blockchain, depending on that specific blockchain (Bitcoin blockchain, Litecoin blockchain, Bitcoin Cash blockchain depending on which cryptocurrency you're sending) congestion at the time you initiate your transaction. Until Abra gets confirmation that the transaction is a valid and unique one, you won't be able to send or withdraw the funds in your Abra wallet.